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In the snap, he and Tess were seen posing next to one of her kangaroo pictures while attending the Australian Geographic Nature Photographer of the Year Awards.

Sent into overdrive: Underneath his post, fans couldn't help but ask: 'Does Mr Robert have himself a girlfriend?'

Robert wished Tess a happy birthday in his post.

'A big happy birthday to Tess. It was so fun to attend the Australian Geographic Nature Photographer of the Year awards ceremony with you! It is wonderful that you were the runner up in our category with your amazing kangaroo photo. Hope you had the best birthday ever!' he wrote.

Tess commented back, thanking Robert for his support.

'Thank you for your birthday wishes! Had the best time in South Australia, looking forward to getting together again soon,' she wrote.